Wiki info about Hurricane Mk IIB/Trop

Although a highly successful and popular fighter, by 1940 the Hurricane Mk I was already showing itself to be inferior to enemy fighters such as the Messerschmitt 109. Experience from the Battle of Britain had also proved that the Hurricane’s rifle-calibre 0.303 machine guns were inferior to larger calibre weapons being operated by enemy aircraft.
The Hurricane I was developed by adding the 1280 HP Rolls Royce Merlin XX engine and lengthening the fuselage slightly. This Hurricane Mk IIA was further modified by adding the ‘universal wing’ to allow the use of under wing stores such as bombs and rockets. When a further two 0.303 inch Browning machine guns were added to each wing, the Hurricane was transformed into the Mk IIb. Whilst the problem of rifle calibre bullets still existed, the Hurricane’s weight of fire had at least been increased as an interim measure whilst more powerful weapons were being refined. 56 Squadron were the first RAF squadron to be equipped with the new Hurricane Mk IIB in February 1941, and by the summer of the same year, 20 squadrons were operating the new Hurricane.
The Hurricane Mk II would see further developments in the form of the Mk IIC, armed with four 20mm Hispano cannon, and the Mk IID which was equipped with two 40mm cannon in under wing pods for anti-tank duties. Whilst the Hurricane was no longer effectively employed in its original role as a fighter by the end of 1942, it would go on to serve in many other capacities until it was finally retired from the RAF in January 1947.